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Stock-Based Compensation Plans (Details 6) (Restricted Stock Unit [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2012 | May 31, 2011 | May 31, 2010
Restricted Stock Unit [Member] |  |  |
Nonvested/unearned shares, other information |  |  |
Total intrinsic value of RSUs vested | $ 11.0 | $ 7.7 | $ 4.8
Total grant-date fair value of RSUs vested | $ 9.5 | $ 8.5 | $ 6.6

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested in period intrinsic values. + References No definition available. + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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